Study on a NiTiHfTa shape memory alloy with high-pressure torsion and subsequent annealing

Authors: Zhang, J., Hu, P., Wang, S., Zhang, Y., Huang, Y., Ding, H.

Journal: Proceedings of SPIE the International Society for Optical Engineering

Publication Date: 01/01/2023

Volume: 12801

eISSN: 1996-756X

ISSN: 0277-786X

DOI: 10.1117/12.3007104

Abstract:

An alloy with the composition of 49.6Ni-35.4Ti-9Hf-6Ta (at%) was processed by high-pressure torsion (HPT) and post-HPT annealing treatment. The microhardness of HPT-processed samples increased obviously, and amorphous feature appeared in 2 turns sample. The microhardness further increased and amorhozation was enhanced in 16 turns sample. After annealing at 750 ℃ for 3h, almost full crystallization occurs in 16 turns sample. In-situ high temperature X-ray diffraction experiment reveals that martensite to austenite transformation took place, indicating the alloy would exhibit SMA effect.

https://eprints.bournemouth.ac.uk/39095/

Source: Scopus